HeadphonesListen to articleMarco Rubio, US Secretary of State, at Homestead Air Reserve Base in Florida on May 21 before travelling to a Nato foreign ministers meeting in Sweden. AFPMarco Rubio, US Secretary of State, at Homestead Air Reserve Base in Florida on May 21 before travelling to a Nato foreign ministers meeting in Sweden. AFPPresident's preference is negotiated agreement, US Secretary of State saysHeadphonesBookmark

US Secretary of State Marco Rubio says a diplomatic settlement with Cuba is unlikely amid worsening tensions and an ongoing US oil blockade.

The administration asserts President Donald Trump has the right and obligation to address perceived national security threats from the island.

Rubio characterises Cuba as a regional terrorism sponsor, citing reported Russian and Iranian intelligence activity and weapons presence on the island.

A US indictment charges Cuban leader Raul Castro with murder and conspiracy to murder American citizens, intensifying pressure on Havana.